Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
DeepSeek V4 Pro (High)
83
GPT-5.3 Codex
86
Verified leaderboard positions: DeepSeek V4 Pro (High) #11 · GPT-5.3 Codex unranked
Pick GPT-5.3 Codex if you want the stronger benchmark profile. DeepSeek V4 Pro (High) only becomes the better choice if coding is the priority or you want the cheaper token bill.
Agentic
+1.5 difference
Coding
+10.7 difference
DeepSeek V4 Pro (High)
GPT-5.3 Codex
$1.74 / $3.48
$1.75 / $14
N/A
79 t/s
N/A
88.26s
1M
400K
Pick GPT-5.3 Codex if you want the stronger benchmark profile. DeepSeek V4 Pro (High) only becomes the better choice if coding is the priority or you want the cheaper token bill.
GPT-5.3 Codex has the cleaner provisional overall profile here, landing at 86 versus 83. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
GPT-5.3 Codex's sharpest advantage is in agentic, where it averages 71.5 against 70. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 63.3% to 77.3%. DeepSeek V4 Pro (High) does hit back in coding, so the answer changes if that is the part of the workload you care about most.
GPT-5.3 Codex is also the more expensive model on tokens at $1.75 input / $14.00 output per 1M tokens, versus $1.74 input / $3.48 output per 1M tokens for DeepSeek V4 Pro (High). That is roughly 4.0x on output cost alone. DeepSeek V4 Pro (High) gives you the larger context window at 1M, compared with 400K for GPT-5.3 Codex.
GPT-5.3 Codex is ahead on BenchLM's provisional leaderboard, 86 to 83. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 63.3% and 77.3%.
DeepSeek V4 Pro (High) has the edge for coding in this comparison, averaging 73.8 versus 63.1. Inside this category, Terminal-Bench Hard is the benchmark that creates the most daylight between them.
GPT-5.3 Codex has the edge for agentic tasks in this comparison, averaging 71.5 versus 70. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.
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